24 hours with 3 teenage birders: Welcome to the World Series of Birding

Otys Train, 16, (left) and teammate Jack Trojan, 17, search for different bird species while competing in the world series of birding at High Point State Park in New Jersey on May 9. They competed in the 43rd annual World Series of Birding where they counted as many bird species within New Jersey as they could in 24 hours.

The three high-school birders, dubbed The Pete Dunnelins, have one day to count as many bird species across the state of New Jersey as physically possible. Here's what it takes.

(Image credit: Mohamed Sadek for NPR)